Keychain battery charger



FIG. 1 is a first perspective view of the keychain battery charger;

FIG. 2 is a second perspective view of the keychain battery charger of FIG. 1;

FIG. 3 is a front view of the keychain battery charger of FIG. 1;

FIG. 4 is a back view of the keychain battery charger of FIG. 1;

FIG. 5 is a top view of the keychain battery charger of FIG. 1;

FIG. 6 is a bottom view of the keychain battery charger of FIG. 1;

FIG. 7 is a left side view of the keychain battery charger of FIG. 1; and,

FIG. 8 is a right side view of the keychain battery charger of FIG. 1. 

CLAIM The ornamental design for a keychain battery charger, as shown and described. 